Encyclopedia of Microtonal Music Theory

spondeiazon / spondeiakos tropos

[John Chalmers, Divisions of the Tetrachord]

The old libation mode, thought to have been originally either a neutral third pentatonic containing a spondeiasmos or a semitonal pentatonic scale similar to E F A B C e. In later times, the mode was identified with the enharmonic [genus] without the microtones. See Chapter VI [of Divisions of the Tetrachord].

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